Rattle from the middle of the car
 

Ok so i have 3000 miles on my car and right before i got my tune my car would make this weird rattle whenever i pulled off from 1st gear or whenever i press the gas at low rpm. Now i never thought anything of it because i had an hks filter in the car and since its not exactly snug in the intake box i thought it was just due to plastic edges shifting around in the box during take off. Today when i started my car the rattle was very high and as the car warmed up it completely died. While i inspected the rattle i thought it was coming from the engine but it was coming from the middle of the car...sounds like somethings loose because it happens when the car vibrates. Has anybody else experienced this.
Just some info
My cars rpm doesnt bounce
No cels have come on, and theres no pending cels
Theres no delay in throttle.

im going to record a video when the car is nice and cold so you guys can see what im talking about....i checked oil as well and its fine!

i know theres a thread of rattles already and it sounds similar but this is the first time ive heard it and it lasted about 5 mins during a cold start and then went away when it got warm...so i want people to tell if they hear this rattle.

[ame="http://www.youtube.com/watch?v=ww3dvDyVlMM"]http://www.youtube.com/watch?v=ww3dvDyVlMM[/ame]

Here a short clip of the rattle..you can here it go away when the engine warms up..does anybody else here this.. it sounds like a loose pipe but im still not sure

I would get under it and check for loose heat shields around the exhaust since you say it goes away when the car is warmed up.

Theres where it sounds like its coming from. I thought it was the engine but its more toward the bottom of the car where the passanger side is. It only does under engine load at a very low rpm like 1200-1500 and when the car is cold. Next week imma just take it to the dealer and see what they say..ill see if they change my hfpf for the chirp too...gotta wait till john is available to flash me back to stock so i can bring her in

^ this

get the car on a hoist and start it up and listen for the rattle.

sounds like maybe a heat sheild or the skid plate.

the fact that your car died is strange though

I think the noise dies because when the car is cold it idles at high causing the engine to vibrate a little so when the engine warms up it goes to a normal rpm and the car is stable and watever is loose stops shaking.

^oh - when you said "it completely died" I thought you meant the car stopped running.

ya after the car is warm it will be running smother so the rattle will not be as prevolant

yea i just got nervous because its the first time ive heard it during a cold start. Ive heard it before doing engine load+low rpm but thought nothing of it. But im guessing it just looser over time and now its more noticeable.

That sounds so abnormal. I'd be too scared to do anything on my own. If I were you, I would just have the dealer take a look at it.

Yea im going to check it out thursday, try and fix the hpfp, as well..i think it is one of the shields that are loose but doesnt hurt to find out..ill let everyone know what it is.